Strength characteristics and microstructure evolution of cemented tailings backfill with rice straw ash as an alternative binder

Wang, Shi; Song, Xuepeng; Wei, Meiliang; Liu, Wu; Wang, Xiaojun; Ke, Yuxian; Tao, Tiejun

doi:10.1016/j.conbuildmat.2021.123780

Cited by 52 publications

(8 citation statements)

References 49 publications

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“…Microscopically, the mechanical characteristics of CTB primarily depend on the spatial morphology and arrangement of its internal core skeleton structure, which encompasses the skeleton grid formed by the bonding of aggregate particles and cementitious materials, as well as the micro-defective structure involving micro-pores, voids, or micro-cracks (Chen and Wu, 2013;Guo et al, 2021;Serge et al, 2007;Song et al, 2022;Zhang et al, 2020a;Zhao et al, 2022b). Simultaneously, SEM results play a significant role in interpreting the hydration reaction behavior of CTB and revealing the influence of microstructure characteristics on the strength enhancement mechanism of CTB (Sari et al, 2022;Serge et al, 2007;Wang et al, 2021;Xu et al, 2020b;Zhang et al, 2020a;Zhao et al, 2022b). In this work, several fragments were selected from the best-performing CTB samples undergoing uniaxial compressive failure for microstructural analysis.…”

Section: Micro Analysis Of Enhancement Mechanism Of Ucsmentioning

confidence: 99%

“…[1][2][3][4]). Available data indicate that approximately 1.28 billion m³ of underground goafs have been formed by mining, and the accumulated tailings from the processed ore in the mineral processing plant have reached 14.6 billion tons (with a growth rate of 600 million tons/year) (Hou et al, 2021;Wang et al, 2021). More critically, the goaf formed during the mining process not only easily causes land subsidence but also reduces the safety of underground operations (Chen et al, 2023;Hou et al, 2021;Zhao et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, compliance with specified mining design and safety production standards is imperative for the UCS of CTB. However, numerous research findings demonstrate that the UCS of CTB is influenced not only by external variables, namely temperature (Fall et al, 2010;Xu et al, 2020a), curing duration (Chen et al, 2023), and curing pressure Yilmaz et al, 2014), but also by intrinsic factors, including the type and dosage of cementitious material (Edraki et al, 2014;Ercikdi et al, 2009b;He et al, 2023;Hou et al, 2021), the mass concentration (Eker and Bascetin, 2022;Guo et al, 2021;Song et al, 2022;Wang et al, 2021), and the ratio of cement-to-tailings (He et al, 2023). It is noteworthy that the proportion of cement-to-tailings has emerged as the primary determinant of the evolution of UCS during the entire curing period, according to the established design standards.…”

Section: Introductionmentioning

confidence: 99%

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Effects of slag-based cementitious material on the mechanical behavior and microstructure evolution of copper-base cemented tailings backfill

Zhang,

Jiang,

et al. 2024

Preprint

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A novel cementitious material (abbreviated as a cementitious powder (CP)) was developed by to achieve low-cost backfill mining. A comparative analysis of the strength test for cemented tailings backfill (CTB) was carried out to demonstrate the superiority of the CP over ordinary Portland cement (OPC). Furthermore, the deformation behavior and failure mode associated with the strength growth mechanism of the CTB assembled with CP were examined using uniaxial compression tests and micro-scanning observation. The findings indicate that CP has significant potential in replacing OPC; A higher mass concentration and longer curing age, as well as a lower tailing-to-cement ratio, have a favorable impact on the strength enhancement of the CTB; And the formation of C-S-H gel and ettringite cement the tailings particles and promote the densification of the cavity structure, thereby resulting in the high strength of CTB at the macro level. This work provides valuable insights into green mining.

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Section: Micro Analysis Of Enhancement Mechanism Of Ucsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of slag-based cementitious material on the mechanical behavior and microstructure evolution of copper-base cemented tailings backfill

Zhang,

Jiang,

et al. 2024

Preprint

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“…Moreover, because incineration ash usually exhibits pozzolanic activity, other types of incineration ash have also been applied as SCMs for CLSM production. These include incineration sludge ash, such as waste paper sludge ash (WPSA) [16], incineration sludge ash [17], and mixed incineration sludge ash [18]; garbage incineration ash, such as domestic waste incinerator bottom ash [19] and industrial waste incineration bottom ash [20]; and biomass incineration ash, such as wood ash [21], corn straw ash [22,23], rice straw ash [24] and bagasse ash [25]. Among the metallurgical industrial by-products, blast-furnace slag is often used as an SCM for CLSM production, due to its high hydration activity.…”

Section: Clsm Strengthmentioning

confidence: 99%

Research Progress on Controlled Low-Strength Materials: Metallurgical Waste Slag as Cementitious Materials

Liu

et al. 2022

Materials

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Increasing global cement and steel consumption means that a significant amount of greenhouse gases and metallurgical wastes are discharged every year. Using metallurgical waste as supplementary cementitious materials (SCMs) shows promise as a strategy for reducing greenhouse gas emissions by reducing cement production. This strategy also contributes to the utilization and management of waste resources. Controlled low-strength materials (CLSMs) are a type of backfill material consisting of industrial by-products that do not meet specification requirements. The preparation of CLSMs using metallurgical waste slag as the auxiliary cementing material instead of cement itself is a key feature of the sustainable development of the construction industry. Therefore, this paper reviews the recent research progress on the use of metallurgical waste residues (including blast furnace slag, steel slag, red mud, and copper slag) as SCMs to partially replace cement, as well as the use of alkali-activated metallurgical waste residues as cementitious materials to completely replace cement for the production of CLSMs. The general background information, mechanical features, and properties of pozzolanic metallurgical slag are introduced, and the relationship and mechanism of metallurgical slag on the performance and mechanical properties of CLSMs are analyzed. The analysis and observations in this article offer a new resource for SCM development, describe a basis for using metallurgical waste slag as a cementitious material for CLSM preparation, and offer a strategy for reducing the environmental problems associated with the treatment of metallurgical waste.

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“…Most researchers mainly focus on substitution ratio, compressive strength, shear strength and other aspects when studying CPB slurry substitute materials [17,18,30]. Nevertheless, the rheological characteristics and pipeline transport characteristics have not been well studied.…”

Section: Introductionmentioning

confidence: 99%

Pipeline Transportation Characteristics of Different Cementing Materials in CPB Slurry

Dong

Aziz

Shafri

et al. 2022

ARFMTS

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Research on the underground filling mining of Cemented Paste Backfilling (CPB) slurry shows that it alleviates the underground subsidence and environmental problems caused by mining, making a strong contribution to the realization of green mining. To optimize performance, cost reductions, and the recycling of agricultural solid waste, some researchers have studied using volcanic fly ash (FA) to replace part of cement. Corn straw fly ash (CSFA) may be used to replace the same amount of part of cement or FA, as corn straw can improve the mechanical properties of FA to make the CPB slurry for filling goaf. On this basis, in order to ensure a good flow of the CPB slurry in the pipeline, we need to conduct pipeline tests on the slurry of these different cement materials to verify their feasibility. In this article, Fluent has been used to study the CPB slurry transport properties in the two cases mentioned above through numerical simulation. Comparing the velocity distribution and pressure loss changes of the CPB slurry with different proportions in the horizontal pipeline provides a reference for future CPB slurry research. The results show that: (1) FA forms a lubricating layer in the pipe wall due to its "ball effect", which effectively reduces the yield stress and pressure loss of the CPB slurry in the pipe, and plays a positive role in the transportation of CPB in the pipe; and (2) CSFA increases the CPB slurry transport pressure loss due to its irregular particle size, increasing the risk of pipe wear. The results are helpful for better understanding and designing paste filling material for mine.

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Strength characteristics and microstructure evolution of cemented tailings backfill with rice straw ash as an alternative binder

Cited by 52 publications

References 49 publications

Effects of slag-based cementitious material on the mechanical behavior and microstructure evolution of copper-base cemented tailings backfill

Effects of slag-based cementitious material on the mechanical behavior and microstructure evolution of copper-base cemented tailings backfill

Research Progress on Controlled Low-Strength Materials: Metallurgical Waste Slag as Cementitious Materials

Pipeline Transportation Characteristics of Different Cementing Materials in CPB Slurry

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